My grandma still thinks theres a $7000 credit card bill?

Wver since august i was using the card to buy mainly clothing and some games for my twin brother and i. We had completely thrown out a good 90 percent of our clothes because my mom would try to pick up cheap clothes. Im not snobbish, but the clothes never fit us. We didnt go ahopping in since lile freshman year, we are seniors now. So i got us shoes l, t shirts, long sleeve clothing and from time to time i bough a videogame. At the end of each month i alwayd informed my mother how much i spent. This added up over 5 months. It really got my grandma mad. However my mom says shes been paying it off. Well my grandma seems to have misinterpreted the statement. At the top of the 8 page list it says overdue balance of 2500. My mom did say shes been sending payments. However when my grandma adds it up it adds up to like 6400. I think she is adding up everything that was bough since august. But is forgetting that most of it is already paid off ao thats why she still thinks we owe 7000.